Means for softening a carton-blank surface



I Aug. 19 1924.-

E. G. STAUDE MEANS FOR SOFTENING/ A CARTON BLANK SURFACE I Filed Nov. 9,192g INVENTOR EDWIN 6. 677711125 ATroRNEYa Patented Au 19, 1924.

stares EDWIN G. STAUDE, OF MINNEAPOLIS, MINNESOTA.

MEANS FOR SOFTENING A CARTON-BLANK SURFACE.

Application filed November 9, 1922. Serial No. 599,882.

To all whom it may concern:

Be it known that I, EDWIN G. STAUDE, a citizen of the United States,resident of Minneapolis, county of Hennepin, and State of Minnesota,have invented certain new and similar covered stock is used, great diiiiculty is experienced in making the. gummed flap covered by the foiladhere at the sealing point when the carton is folded. Adhesive such asglue, dextrin, or gum arabic, ordiurarily used for this purpose will notadhere on a foil covered surface. The only adhesive now used with somemeasure. of success is asphalt, but the use'of this material involvesvery careful handling, as it must be kept very hot, for when it cools,it immediately becomes hard and frequently necessitates shutting downthe box-making machinery, and a long tedious cleaning operation beforestarting up again. Furthermore, asphalt when used as an adhesive 'on afoil surface has less than one-half the efficiency of ordinary hot glueapplied to contacting paper surfaces.

The object, therefore, of this inventionv is to provide means forremoving the thin coating of tinfoil by subjecting it to heat andexposing the pa er beneath, or the asphalt by which the fo1l is held tothe surface of the stock. I prefer tp pass the stock over a hot-surfaceand melt the foil requiring only about 600 degrees Fahrenheit and alsomelt the asphalt beneath, the foil disappearing when melted. The flapwill stick to the op; posite surface when the foil is melted without theaddition of more adhesive as the asphalt originally used for stickingthe foil to the stock will be suificient when exposed V to the heatingelement and softened thereby to hold the two paper surfaces togethersecurely. I may, however, easily addfmore hot glue to the stock surfaceif desired, as with the foil removed, the stock will be handled a thesame as any ordinary carton stock; that is, it may be glued by anyordinary wellnown adhesives used in. standard gluing machines.

In the accompanying drawings; forming part of this specification,

-Figure 1 is a sectional view illustrating the application of myinvention to a gluing machine taken on section line 11 of Figure 2; I

Figure 2 is a sectional view taken on section line 22 of Figure 1;

Figure 3 is a sectional view taken on the line 33 of Figure 2.

In the drawing, 2 represents the frame of the machine having the usualbelt conveyor 3 on which the blanks are fed to the rolls 4. 5 is'an armsecured by suitable means such as bolts 6 to the frame of themachine,-and 7 is a bracket slidable on said arm.by means of a bolt 8,and a slot 9 in said bracket.

The presser wheel 10 is carried by said bracket to rest upon the uppersurface of the blank. Beneath the presser wheel, the bracket is providedwith a horizontally extending arm 11 which supports a heating element 12having a flattened upper surface 13 to bear on the under side of theblank and provided with a coil having electric conductors 1 leading to asuitable source of electrical energy for conducting a current to thecoil to heat the surface 13 and melt the parafiine, wax, tinfoil orother agent with which the surface of the carton blank may be coated.The effect of this heating is to expose a raw porous surface of thestock which will immediately absorb the adhesive- As the stock contactswith the heated surface of the device 12, a

and hold it firmly.

narrow path from which the finish or glue is removed will appear in thestock surface ready to receive and absorb the glue or other adhesiveapplied thereto.

The horizontal arm 11 is preferably pivotally mounted upon the bracket5, by means or a pin 15 and lugs 53, preferably integral with the lowerportion of the bracket.

A notched quadrant 16, integrally formed with the arm-11, is providedand adapted to be engaged by a suitable spring hook 17 secured to thearm 5. A hand or finger grip 18 is secured to the quadrant 16 by whichthe operatormay lower the heating element 12 to disengage it from thecarton blank or stock, .as shown by dotted lines in Figure 2. The objectof this movement is to disengage the heating element from thecartonstock whenthe machine is stopped, thus preventing said element fromburning and destroying the carton blank, which otherwise wouldbe heldstationary against the heated surface 13 of the heating element 12. Whenthe operator desires to start the machine, he

will raise the element 12 from the dotted to the full line position, bymeans of the grip 18, in which position the surface 13 will againcontact with the under side of the carton blank. v

A glue pot 19 is provided adjacent the heating element having wheels 20and 21 between which the blanks pass; the wheel 20.

. with parafline, wax, foil, or made of waterproof board or any othersuitable material,

my purpose being to so heat and soften the 7 surface of the stock thatthe. finish or coating thereon will be dissipated and the unfinished orraw fiber beneath exposed to receive the coating of adhesive.

I claim as my invention:

I. In combination with means for feeding a flexible carton or containerstock preparatory to applying an adhesive thereto, a bracket, a heatingmeans supported by said bracket and over which the carton blank is fed,and means for pressing the cartonagainst the surface of'said heatingmeans. 2. In combination with means for feeding a flexible carton orcontainer stock, means for heating the surface of the stock to de--stroy the finish or coating thereon, said heating means being mountedfor movement to a point comparatively remote from the path of the stockwhen the machine is stationary. 3. The combination with means forfeeding a flexible carton or container stock, of

-an arm, a bracket slidable thereon, a presser wheel carried by saidbracket and a heating element supported beneath said bracket in positionto apply heat to the surface of 'the stock fed between said wheel andheating element. V

4. The combination with means for feeding a flexible carton or containerstock, of a bracket, an arm thereon, a heating element having aflattened upper surface to bear on the surface of the stock, and adaptedfor movement toward and from the stock, and means for pressing'the stockagainst the surface of said element.

5. The combination with means for feeding a flexible carton or containerstock, of a presser wheel and heating element between which the stock.is fed, an adjustable support for said wheel and heating element,v

and. means for moving the heating element toward and from the surface ofthe stock. In witness whereof, I have hereunto set my hand this 6th dayof November, 1922.

nn'win e. s'rAn'nE.

